Please can anyone help? My mc18 starts fine cold and after a few seconds revs at 5/6 000 rpm without touching the throttle, turn of the choke and after 30 seconds it drops to 2000 and then a minute after it will drop to 1100 and idle perfectly,yesterday out on a run cruising along @ 70 mph fine,then i gave it a blast it flew straight up to 10000 rpm in top then all of a sudden it lost power surging like fuel starvation,i slowed back down without choice to 60 mph then after a short time wound it back up and it shot back up to 10000 in top pulling very strong and as soon as you close the throttle off a little it starts losing power and surges again, when stationary if you hold the throttle @ 5000 rpm it will rise up to 6000 rpm without moving the throttle,Lesviffer and i reset float levels and cleaned carbs throughly,started it today and its the same,any comments or advice greatly appreciated, jonmac
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John